So the rules went from 9b rules to call shot and 10b last in 2008? Interesting. I assumed it was after that because you didn’t include a 10b last vs early 10b in your list of distinctions. At least in my experience that’s the biggest rule disparity I see in tournaments and (non-Filipino) action games.
Well, now I'm not sure when 10 ball last went in. The BCA rulebook seems not to have tracked the WPA changes for 10-ball very well, so I'll have to paw through old files. I think there was a major revision in 2009 or 2016 and the change may have happened then. Also, the safety rule seems not to have been in the 2008 version. I have edited my post above.
Another edit: the WPA rules can be found on archive.org at least for some years. In April, 2008, it was allowed to call safe and there was no pass-back. In addition, the ten could be called early and made for the early win.
In January, 2009, winning the game on the break was eliminated. The "wrongfully pocketed balls" rule was added -- pass-back. It was still possible to win with an early 10, just not on the break. The safety rule was still in, but the WPB rule made it irrelevant.
And another edit.... The full "ten ball last" rule came in with the March, 2016 rules revision. It is kind of hidden in Rule 9.8, "Continuing Play".
(Side note: It is fortunate that archive.org can show those old rules. Some websites are very complicated and require auxiliary software, and archive.org doesn't handle those well. Also, some service providers do strange things that seem to prevent proper archiving. Since 2025, the archived version of wpa-pool.com seems to redirect to a porn site.)
